Soluzione - Long subtraction
6,7
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 3 | , | 5 | |
| 2 | , | 1 | ||
| - | 4 | , | 7 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the tenths column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (15).
| Place value | tens | ones | . | tenths |
| 2 | 15 | |||
| 1 | 3 | , | 5 | |
| 2 | , | 1 | ||
| - | 4 | , | 7 | |
| , |
Subtract the numbers in the tenths column from the top number:
15-1-7=7
| Place value | tens | ones | . | tenths |
| 2 | 15 | |||
| 1 | 3 | , | 5 | |
| 2 | , | 1 | ||
| - | 4 | , | 7 | |
| , | 7 |
Because the upper digit (2) in the ones column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (12).
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 2 | 15 | |||
| 1 | 3 | , | 5 | |
| 2 | , | 1 | ||
| - | 4 | , | 7 | |
| , | 7 |
Subtract the numbers in the ones column from the top number:
12-2-4=6
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 2 | 15 | |||
| 1 | 3 | , | 5 | |
| 2 | , | 1 | ||
| - | 4 | , | 7 | |
| 6 | , | 7 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 2 | 15 | |||
| 1 | 3 | , | 5 | |
| 2 | , | 1 | ||
| - | 4 | , | 7 | |
| 0 | 6 | , | 7 |
The solution is: 6,7
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